Cartridge-type cutting tool with insert lock

ABSTRACT

A rotary cutting tool having one or more cartridges for holding a cutting insert. Each cartridge is disposed in a longitudinal groove in the tool head, and a semicircular ringlike cam lock is disposed in a transverse slot in the cartridge body. Tightening of a setscrew in the cartridge body forces one cam lock end portion into engagement with the insert to lock it in place. The cam lock is also forced against the tool head groove wall to screw the assembly in place. An additional cartridge clamp is also provided for radial adjustment.

lJnited'States Patent Schiller [54] CARTRIDGEPTYPE CUTTING TOOL WITH INSERT LOCK [72] Inventor: Adam A. Schiller, Waukesha, Wis.

[73] Assignee: Waultesha Cutting Tools, lnc., Waukesha,

Wis.

[22] Filed: Apr. 2, 1970 [21] Appl. No.: 25,113

[52] US. Cl. ..408/ 197, 29/ 105 A [51] Int. Cl ..B23b 29/03 [58] Field of Search ..29/105 R, 105 A; 408/197 [56] References Cited UNITED STATES PATENTS 1,190,197 7/1916 Shimer... ..29/105 R 3,391,438 7/ 1968 Milewski ..29/ 105 R [451 Feb. 22, 1972 FOREIGN PATENTS OR APPLICATIONS 189,482 4/1957 Austria ..29/l05 A Primary Examiner-Gerald A. Dost Att0meyAndrus, Sceales, Starke & Sawall [57] ABSTRACT A rotary cutting tool having one or more cartridges for holding a cutting insert. Each cartridge is disposed in a longitudinal groove in the tool head, and a semicircular ringlike cam lock is disposed in a transverse slot in the cartridge body. Tightening of a setscrew in the cartridge body forces one cam lock end portion into engagement with the insert to lock it in place. The cam lock is also forced against the tool head groove wall to screw the assembly in place. An additional cartridge clamp is also provided for radial adjustment.

9 Claims, 5 Drawing Figures PATENTEI] F E8 2 2 I972 FIGA INVENTOR. ADAM A. SCHILLER 1W2 JZM Attorneys CARTRIDGE-TYPE CUTTING TOOL WITH INSERT LOCK BACKGROUND OF THE INVENTION This invention relates to a cutting tool, and more particularly to a rotary cutting tool for use in boring and the like, with provision for clamping one or more throwaway cutting inserts in a cartridge mounted in the tool body.

SUMMARY OF THE INVENTION The invention contemplates the use of a removable cartridge which is disposed in a recess in the tool head. The cartridge is adapted to hold the insert therein, and a rotary cam lock secures the insert within the cartridge and also clamps the cartridge into the tool head. An additional cartridge clamp is also provided.

DESCRIPTION OF THE DRAWING FIG. 3 is a transverse section taken on line 3--3 of FIG. 2.

and showing the cam lock in released position;

FIG. 4 is a section similar to FIG. 3 and showing the cam lock in insert-holding position; and

FIG. 5 is a view similar to FIG. 2, showing a cartridge mounted with a different axial rake.

DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in the drawing, the invention is embodied in a tool comprising a tool body I having an inner end portion adapted to be secured to the spindle of a suitable rotary drive mechanism (not shown). The outer cutting end portion of tool body 1 forms a generally cylindrical head 2 having an outer annular peripheral surface 3.

Head 2 is adapted to receive one or more cartridge assemblies 4. For this purpose, and for each assembly, a generally longitudinal cartridge-receiving recess or groove 5 is provided in surface 3. Groove 5 may be formed by boring or some other suitable process and, while it is shown as cylindrical, it may be other than cylindrical without departing from the spirit of the invention. Each groove thus forms an interruption in surface 3.

Cartridge assembly 4 is adapted to receive a removable cutting insert or bit 6 and hold it in head 2. The assembly comprises a cartridge body 7 of generally cylindrical shape which is dimensioned to fit within groove 5 in a complimentary manner. Body 7 is provided with a longitudinal outwardly facing slot 8 for holding a bit 6 therein, with the slot having opposed walls 9, 10. An adjustable stop 11 is threaded into body 7 for seating the bit.

For purposes of locking bit 6 within assembly 4 and for simultaneously locking the assembly within groove 5, locking means are provided which tighteningly bears on the groove wall and bit. This means comprises a generally semicircular ringlike cam lock 12 which is disposed in a transverse slot I3 formed in the inner wall of body 7 and which communicates with slot 8. Cam lock I2 has a curved bearing edge surface 14 of slightly shorter radius than groove 5, an end bearing portion 15 disposed adjacent bit 6, and an opposite end portion or face 16 for engagement by a setscrew l7 threaded into body 7.

To install cartridge assembly 4 in tool head 2, it is slid into groove 5 so that it is relatively loosely positioned therein, as shown in FIG. 3. Tightening of setscrew 17 will cause cam lock I2 to rotate in slot 13 until portion 15 engages bit 6 and forces it against wall 9. At the same time, surface I4 of cam lock 12 will be forced against the wall of groove 5, as shown in FIG. 4, thus securing the entire assembly in place.

When groove 5 is circular, the radial rake of bit 6 can be varied by providing a suitably positioned flat 18 on the outer sidewall of body 7 and by tightening a setscrew 19 in head 2 against the flat. Screw I9 also holds body 7 in place so that a worn bit can be released and replaced without releasing the entire assembly from groove 5.

The axial rake of bit 6 can also be varied by varying the angle of groove 5, as shown in FIG. 5.

The invention provides a unique cartridge structure for cutting tools which use removable bits.

Various modes of carrying out the invention are contemplated as being within the scope of the following claims particularly pointing out and distinctly claiming the subject matter which is regarded as the invention.

Iclaim:

l. A cutting tool comprising:

a. a tool body having a portion adapted to be rotatably driven and a cutting portion forming a head,

b. said head having at least one generally longitudinal groove disposed in the periphery thereof,

c. a removable cartridge assembly disposed in said groove,

d. a cutting bit disposed in said assembly,

c. said assembly including cam lock means for locking said bit therewithin and for simultaneously securing said assembly in said groove.

f. means for securing said cartridge assembly at a desired radial angle within said groove.-

2. A cutting tool comprising:

a. a tool body having a portion adapted to be rotatably driven and a cutting portion forming a head,

b. said head having at least one generally longitudinal groove disposed in the periphery thereof,

c. a removable cartridge assembly disposed in said groove,

d. and a cutting bit disposed in said assembly, said cartridge assembly including a cartridge body having:

I. a longitudinal slot receiving said bit,

2. and a transverse slot communicating with said longitudinal slot,

. said assembly including cam lock means for locking said bit therewithin and for simultaneously securing said assembly in said groove,

f. said cam lock means including a semicircular member having:

I. a curved bearing surface for engaging the wall of said groove,

2. and an end bearing portion for engaging said bit.

3. The cutting tool of claim 2 wherein:

. said member also includes an end portion opposite from said end bearing portion,

b. and said cam lock means also includes means for tighteningly engaging said end portion to force said end bearing portion against said bit and said curved bearing surface against the groove wall.

4. The cutting tool of claim 2 in which said curved bearing surface has a radius which is shorter than the radius of said groove.

5. The cutting tool of claim 2 in which said member is ringlike in configuration.

6. The cutting tool of claim 2 which includes: means for securing said cartridge body within said groove so that said cam lock means can be released for bit replacement without releasing said cartridge body from said groove.

7. The cutting tool of claim 6 wherein said securing means comprises: tightening means in said tool head and engageable with said cartridge body to tighten the latter against the groove wall.

8. The cutting tool of claim 7;

a. in which said groove wall is circular,

b. and a flat on said cartridge body for engagement by said tightening means to set said assembly and bit at a desired radial angle.

9. A cutting tool comprising:

a. a tool body having a portion adapted to be rotatably driven and a cutting portion forming a head,

also having an end portion for engaging said cutting bit, f. and means to rotate said member so that said cam surface secures said assembly in said groove and said end portion simultaneously locks said bit in said assembly. 

1. A cutting tool comprising: a. a tool body having a portion adapted to be rotatably driven and a cutting portion forming a head, b. said head having at least one generally longitudinal groove disposed in the periphery thereof, c. a removable cartridge assembly disposed in said groove, d. a cutting bit disposed in said assembly, e. said assembly including cam lock means for locking said bit therewithin and for simultaneously securing said assembly in said groove. f. means for securing said cartridge assembly at a desired radial angle within said groove.
 2. A cutting tool comprising: a. a tool body having a portion adapted to be rotatably driven and a cutting portion forming a head, b. said head having at least one generally longitudinal groove disposed in the periphery thereof, c. a removable cartridge assembly disposed in said groove, d. and a cutting bit disposed in said assembly, said cartridge assembly including a cartridge body having:
 2. and a transverse slot communicating with said longitudinal slot, e. said assembly including cam lock means for locking said bit therewithin and for simultaneously securing said assembly in said groove, f. said cam lock means including a semicircular member having:
 2. and an end bearing portion for engaging said bit.
 3. The cutting tool of claim 2 wherein: a. said member also includes an end portion opposite from said end bearing portion, b. and said cam lock means also includes means for tighteningly engaging said end portion to force said end bearing portion against said bit and said curved bearing surface against the groove wall.
 4. The cutting tool of claim 2 in which said curved bearing surface has a radius which is shorter than the radius of said groove.
 5. The cutting tool of claim 2 in which said member is ringlike in configuration.
 6. The cutting tool of claim 2 which includes: means for securing said cartridge body within said groove so that said cam lock means can be released for bit replacement without releasing said cartridge body from said groove.
 7. The cutting tool of claim 6 wherein said securing means comprises: tightening means in said tool head and engageable with said cartridge body to tighten the latter against the groove wall.
 8. The cutting tool of claim 7: a. in which said groove wall is circular, b. and a flat on said cartridge body for engagement by said tightening means to set said assembly and bit at a desired radial angle.
 9. A cutting tool comprising: a. a tool body having a portion adapted to be rotatably driven and a cutting portion forming a head, b. said head having at least one generally longitudinal groove disposed in the periphery thereof, c. a removable cartridge assembly disposed in said groove, d. a cutting bit disposed in said assembly, e. a rotatably member disposed in said assembly and having a curved edge cam surface for engaging said groove and also having an end portion for engaging said cutting bit, f. and means to rotate said member so that said cam surface secures said assembly in said groove and said end portion simultaneously locks said bit in said assembly. 